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Property and Equipment, Net (Detail) (USD $)
In Thousands, unless otherwise specified
May 04, 2013
Feb. 02, 2013
Apr. 28, 2012
Jan. 28, 2012
Property, Plant and Equipment [Line Items]        
Property and equipment, gross   $ 90,570   $ 64,744
Less: accumulated depreciation and amortization (34,463) (31,530) (24,811) (22,704)
Property and equipment, net 61,611 59,040 44,441 42,040
Furniture and fixtures [Member]
       
Property, Plant and Equipment [Line Items]        
Property and equipment, gross   31,680   23,354
Leasehold improvements [Member]
       
Property, Plant and Equipment [Line Items]        
Property and equipment, gross   41,671   32,275
Computer and equipment [Member]
       
Property, Plant and Equipment [Line Items]        
Property and equipment, gross   10,541   7,477
Construction in process [Member]
       
Property, Plant and Equipment [Line Items]        
Property and equipment, gross   $ 6,678   $ 1,638